沿兰新铁路由甘肃进入新疆境内踏上哈密绿洲，在哈密市以西的铁路沿线，你会发现一行行南北向整齐排列、状如火山堆积物的土包，这便是勤劳的哈密人民开挖坎儿井所堆积的泥土、沙砾。被誉为“地下长城”的坎儿井，曾经促进了哈密绿洲农业的迅速发展。但在大修防渗渠、水库... Along the Lanzhou-Xinjiang Railway, Gansu enters Xinjiang and enters the Hami Oasis. Along the railway line west of Hami City, you will find land and bags lined up in a north-south orientation that resembles volcanic deposits. This is how diligent Hami people excavate. The soil and gravel accumulated in Karez. Karer Well, known as the Underground Great Wall, has promoted the rapid development of agriculture in the Hami Oasis. But in overhauling anti-seepage canal, reservoir...